"The current version number of the standard GameShark device is 2.5. The current version of the GameShark Pro device is 3.3. Both of these devices have 2,093 codes for 188 games and also includes the long enable code for the Donkey Kong® 64 game. The GameShark Pro device contains code creation utilities that allow you to create your own GameShark codes."
v2.50 confirmed to be pristine as per the official Gameshark website upgrade policy page: https://web.archive.org/web/20010618223715/http://www.gameshark.com/articles/index.jsp?content_id=4878
"The current version number of the standard GameShark device is 2.5. The current version of the GameShark Pro device is 3.3. Both of these devices have 2,093 codes for 188 games and also includes the long enable code for the Donkey Kong® 64 game. The GameShark Pro device contains code creation utilities that allow you to create your own GameShark codes."